Specifications

10
Efficiency calculations include internal fans and line filter. The power supply size is 4.4 inch x 63 inch x 8 inch
(57 inch) with an output power density of ~9.6W/inch. The power supply ships with two W40S12BUA5-01 40
mm^2 x 28 mm NIDEC fans or equivalent, producing 36 CFM (18 CFM each) at .5 INWG using 13.2 W
(6.6 W each).
In terms of the power supply load-sharing algorithm when two supplies are installed, the power load is shared
equally across both supplies to improve longevity. All 6600 series products utilize the same power supply to
reduce sparing.
Figure 3: HP ProCurve 6600 Switch Power Supply (J9269A)
HP ProCurve 6600 Switch Fan Tray (J9271A)
The fan tray assembly contains the cooling fans for the interior of the 6600 chassis; the power supplies have
their own internal cooling fans. The 6600 fan tray consists of eight variable-speed fans, which offer N+N
redundancy. Thus, half of the eight fan rotors can fail and the system will maintain cooling capacity. The fan
speed is based on the sensed ambient temperature inside the chassis.
The default airflow configuration for the fan tray is power supply side to port side (front to back, also described
as power to port side). Figure 4 shows the default direction for the 6600 series products. The fan tray is
mechanically reversible, by first removing the fan tray and then removing the torque screws on sides of the fans
assembly. Reversing the fan tray should occur when the system has been powered off to allow adequate time.
A position sensor determines the configuration of the fan tray, which is then reported through the CLI as to the
direction of the airflow. There is a system configuration option (see section titled “Monitoring airflow direction”)
to report an error if a replacement fan is installed with the incorrect fan orientation.
To support high-availability data center configurations, the fans tray can be replaced without system shutdown
if replacement occurs in under 3 minutes (the 6600 software monitors the time and takes required action to
protect the system). Because the fan tray can easily be replaced in less than 30 seconds, the 3-minute service
window provides adequate time to make a replacement, but users should replace the fans as quickly as
possible. Care must also be taken to install the replacement fan tray to help ensure that the airflow direction is
correct for the product’s deployment.
To reduce sparing requirements, all 6600 series products utilize the same fan tray.
Figure 4: Default airflow direction and connectivity side view of the 6600-24XG switch